I bought a refurbished electric jack off ebay many years ago and a friend of mine bought new one a few months ago. Both worked out well.
But still with ebay, I would recommend caveat emptor. Dont buy from brand new sellers and check their rating. See if they have a real physical location and phone number.
Disclaimer- I have bought from new sellers and sellers with no physical location, but I weighed that risk against the price.
Also note, you can get crappy stuff from Amazon also. They are not perfect.